Query：
学者姓名：方昕
Refining：
Year
Type
Indexed by
Source
Complex
Former Name
Co-
Language
Clean All
Abstract ：
The development of high-quality organic scintillators encounters challenges primarily associated with the weak X-ray absorption ability resulting from the presence of low atomic number elements. An effective strategy involves the incorporation of halogen-containing molecules into the system through co-crystal engineering. Herein, we synthesized a highly fluorescent dye, 2,5-di(4-pyridyl)thiazolo[5,4-d]thiazole (Py2TTz), with a fluorescence quantum yield of 12.09%. Subsequently, Py2TTz was co-crystallized with 1,4-diiodotetrafluorobenzene (I2F4B) and 1,3,5-trifluoro-2,4,6-triiodobenzene (I3F3B) obtaining Py2TTz-I2F4 and Py2TTz-I3F3. Among them, Py2TTz-I2F4 exhibited exceptional scintillation properties, including an ultrafast decay time (1.426 ns), a significant radiation luminescence intensity (146% higher than Bi3Ge4O12), and a low detection limit (70.49 nGy s-1), equivalent to 1/78th of the detection limit for medical applications (5.5 mu Gy s-1). This outstanding scintillation performance can be attributed to the formation of halogen-bonding between I2F4B and Py2TTz. Theoretical calculations and single-crystal structures demonstrate the formation of halogen-bond-induced rather than pi-pi-induced charge-transfer cocrystals, which not only enhances the X-ray absorption ability and material conductivity under X-ray exposure, but also constrains molecular vibration and rotation, and thereby reducing non-radiative transition rate and sharply increasing its fluorescence quantum yields. Based on this, the flexible X-ray film prepared based on Py2TTz-I2F4 achieved an ultrahigh spatial resolution of 26.8 lp per mm, underscoring the superiority of this strategy in developing high-performance organic scintillators. Two organic halogen co-crystal scintillators with strong halogen-bond-induced charge-transfer interactions enable a fast response, low detection limit and ultra-high-resolution imaging.
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Yu-Hua , Zhang, Guo-Zhen , Chen, Fu-Hai et al. Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging [J]. | CHEMICAL SCIENCE , 2024 , 15 (20) : 7659-7666 . |
| MLA | Chen, Yu-Hua et al. "Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging" . | CHEMICAL SCIENCE 15 . 20 (2024) : 7659-7666 . |
| APA | Chen, Yu-Hua , Zhang, Guo-Zhen , Chen, Fu-Hai , Zhang, Shu-Quan , Fang, Xin , Chen, Hong-Ming et al. Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging . | CHEMICAL SCIENCE , 2024 , 15 (20) , 7659-7666 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Correction for 'Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging' by Yu-Hua Chen et al., Chem. Sci., 2024, https://doi.org/10.1039/d4sc00735b.
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Yu-Hua , Zhang, Guo-Zhen , Chen, Fu-Hai et al. Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging (20 Apr, 10.1039/d4sc00735b, 2024) [J]. | CHEMICAL SCIENCE , 2024 , 15 (21) : 8249-8249 . |
| MLA | Chen, Yu-Hua et al. "Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging (20 Apr, 10.1039/d4sc00735b, 2024)" . | CHEMICAL SCIENCE 15 . 21 (2024) : 8249-8249 . |
| APA | Chen, Yu-Hua , Zhang, Guo-Zhen , Chen, Fu-Hai , Zhang, Shu-Quan , Fang, Xin , Chen, Hong-Ming et al. Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging (20 Apr, 10.1039/d4sc00735b, 2024) . | CHEMICAL SCIENCE , 2024 , 15 (21) , 8249-8249 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Rylene diimides are an attractive class of organic dyes owing to their exceptional optical properties and optoelectronic applications. Herein, we extend their applications to the realm of X-ray imaging. The emissive 1,1 '-bi(2-naphthol-4,5-dicarboximide) (BiND-OH) and its phenyl/methyl derivatives, BiND-OPh and BiND-OMe, have been selected to investigate the structure-activity relationships between their crystal packing and X-ray scintillation properties. Single crystal X-ray diffraction results indicate that BiND-OH forms a tightly structured conformation with two interlocks by hydrogen bonding, leading to a charge transfer state and resulting in nearly non-scintillation. In contrast, the radioluminescence intensities of BiND-OPh and BiND-OMe have increased by about 73 and 537 times, respectively, owing to the disruption of hydrogen bonding control and the formation of a J-aggregation fraction dominated by pi-pi interactions. Remarkably, BiND-OMe displays superior scintillation properties, marked by reduced non-radiative transitions, attributed to greater pi-pi plane distances, extended slip distances, and diminished pi-plane overlap areas. It demonstrates a low detection limit of 70.68 nGy s(-1) and a short decay time of 4.37 ns. When applied to X-ray imaging, it produces a high spatial resolution of 11.0 lp mm(-1). This finding provides valuable insights into the profound impact of molecular structure and aggregation state on the organic scintillation properties.
Keyword ：
crystal packing crystal packing fluorescence fluorescence molecular structures molecular structures organic scintillators organic scintillators X-ray imaging X-ray imaging
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Jingru , Liu, Guangsheng , Chen, Fuhai et al. Binaphthol diimide scintillators for X-ray imaging [J]. | SCIENCE CHINA-MATERIALS , 2024 , 67 (8) : 2583-2589 . |
| MLA | Chen, Jingru et al. "Binaphthol diimide scintillators for X-ray imaging" . | SCIENCE CHINA-MATERIALS 67 . 8 (2024) : 2583-2589 . |
| APA | Chen, Jingru , Liu, Guangsheng , Chen, Fuhai , Chen, Yong , Fang, Xin , Chen, Hongming et al. Binaphthol diimide scintillators for X-ray imaging . | SCIENCE CHINA-MATERIALS , 2024 , 67 (8) , 2583-2589 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Mn-based metal halides scintillators with high photoluminescence quantum yield (PLQY) have recently emerged as promising large-size candidates for X-ray imaging but still remains as difficult challenge in stability and high processing temperatures. Here, three manganese halides are designed by introducing branched chains into organic cations and extending the carbon chains, namely (i-PrTPP)2MnBr4, (i-BuTPP)2MnBr4 and (i-AmTPP)2MnBr4, successfully lowered the melting point of manganese halides to 120.2 degrees C. Three materials show striking light yields of 59 000, 40 000, and 52 000 photons MeV-1, respectively. The lowest detection limits are 42.30, 50.92, and 45.71 nGy s-1, respectively. Meanwhile, compared to their counterparts with linear carbon chains, the introduction of branched chains has significantly enhanced the stability of the scintillators in the glass state. A transparent glass has been prepared using a melt-quenching method, which exhibited 80% transmittance at 400-700 nm. The glass is utilized for X-ray imaging, achieving a high spatial resolution up to 46.6 lp mm-1. This result provides a new approach to enhancing the performance of such scintillator materials.
Keyword ：
glass scintillator glass scintillator low temperature melting low temperature melting metal halide metal halide stability stability X-ray detection X-ray detection
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Shichuan , Guo, Cuiling , Chen, Shan-Ci et al. Enhanced Stability of Melt-Processable Organic-Inorganic Hybrid Manganese Halides for X-Ray Imaging [J]. | SMALL , 2024 , 20 (52) . |
| MLA | Chen, Shichuan et al. "Enhanced Stability of Melt-Processable Organic-Inorganic Hybrid Manganese Halides for X-Ray Imaging" . | SMALL 20 . 52 (2024) . |
| APA | Chen, Shichuan , Guo, Cuiling , Chen, Shan-Ci , Di, Yiming , Fang, Xin , Lin, Mei-Jin et al. Enhanced Stability of Melt-Processable Organic-Inorganic Hybrid Manganese Halides for X-Ray Imaging . | SMALL , 2024 , 20 (52) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Organic fluorescence scintillators, owing to the ultrafast response time, versatile chemical structures, low processing temperature, and low cost, are considered as one of the promising materials for medical diagnostics, radiation detection, and X-ray astronomy. However, the low radioluminescence (RL) intensity and low sensitivity hinder their practical applications. In this work, a highly efficient organic fluorescent scintillator, 4,4 '-bis(9-carbazolyl)biphenyl (CBP), is presented, exhibiting a high X-ray RL intensity, narrow full width at half-maximum of 49 nm, and ultrafast decay time of 1.15 ns. More importantly, it has a low detection limit of 25.5 nGy s(-1), which is only 1/215 dose rate compared with the commercial X-ray diagnostics. Such an excellent scintillation performance is mainly attributed to its high photoluminescence quantum yield (PLQY = 61.92%) and good carrier transport (average hole mobility of 0.094 cm(2) V-1 s(-1)). By mixing the CBP into polydimethylsiloxane, the fabricated large area flexible film can be applied in X-ray radiography, which exhibits a high spatial resolution of 14.3 lp mm(-1) at MTF > 0.2. This work paves a way for the implementation of organic fluorescence dyes with high PLQY, high carrier mobility in efficient X-ray scintillation and imaging.
Keyword ：
carbazole derivatives carbazole derivatives fluorescence fluorescence organic scintillators organic scintillators X-ray imaging X-ray imaging
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Hongming , Lin, Miao , Zhao, Changbin et al. Highly Efficient, Low-Dose, and Ultrafast Carbazole X-Ray Scintillators [J]. | ADVANCED OPTICAL MATERIALS , 2023 , 11 (10) . |
| MLA | Chen, Hongming et al. "Highly Efficient, Low-Dose, and Ultrafast Carbazole X-Ray Scintillators" . | ADVANCED OPTICAL MATERIALS 11 . 10 (2023) . |
| APA | Chen, Hongming , Lin, Miao , Zhao, Changbin , Zhang, Dongwei , Zhang, Yang , Chen, Fuhai et al. Highly Efficient, Low-Dose, and Ultrafast Carbazole X-Ray Scintillators . | ADVANCED OPTICAL MATERIALS , 2023 , 11 (10) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Organic scintillators with efficient X-ray excited luminescence are essential for medical diagnostics and security screening. However, achieving excellent organic scintillation materials is challenging due to low X-ray absorption coefficients and inferior radioluminescence (RL) intensity. Herein, supramolecular interactions are incorporated, particularly halogen bonding, into organic scintillators to enhance their radioluminescence properties. By introducing heavy atoms (X = Cl, Br, I) into 9,10-bis(4-pyridyl)anthracene (BPA), the formation of halogen bonding (BPA-X) enhances their X-ray absorption coefficient and restricts the molecular vibration and rotation, which boosts their RL intensity. The RL intensity of BPA-Cl and BPA-Br fluorochromes increased by over 2 and 6.3 times compared to BPA, respectively. Especially, BPA-Br exhibits an ultrafast decay time of 8.25 ns and low detection limits of 25.95 +/- 2.49 nGy s-1. The flexible film constructed with BPA-Br exhibited excellent X-ray imaging capabilities. Furthermore, this approach is also applicable to organic phosphors. The formation of halogen bonding in bromophenyl-methylpyridinium iodide (PYI) led to a fourfold increase in RL intensity compared to bromophenyl-methyl-pyridinium (PY). It suggests that halogen bonding serves as a promising and effective molecular design strategy for the development of high-performance organic scintillator materials, presenting new opportunities for their applications in radiology and security screening. The incorporation of supramolecular halogen bonding into fluorescence and room-temperature phosphorescence systems containing pyridine rings offers a powerful means to significantly enhance the radioluminescence properties of organic materials, thereby enabling high-resolution X-ray imaging.image
Keyword ：
halogen-bonding halogen-bonding organic scintillators organic scintillators supramolecular interaction supramolecular interaction X-ray imaging X-ray imaging
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Hongming , Lin, Miao , Zhu, Yanan et al. Halogen-bonding boosting the high performance X-ray imaging of organic scintillators [J]. | SMALL , 2023 , 20 (14) . |
| MLA | Chen, Hongming et al. "Halogen-bonding boosting the high performance X-ray imaging of organic scintillators" . | SMALL 20 . 14 (2023) . |
| APA | Chen, Hongming , Lin, Miao , Zhu, Yanan , Zhang, Dongwei , Chen, Jingru , Wei, Qingsong et al. Halogen-bonding boosting the high performance X-ray imaging of organic scintillators . | SMALL , 2023 , 20 (14) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The incorporation of sulfonyl fluoride groups into molecules has been proven effective in enhancing their biological activities or introducing new functions. Herein, a transition-metal-free and visible-light-mediated radical tandem cyclization of unsaturated carboxylic acid is reported. This affords a facile access to FSO2-functionalized gamma-lac-tones efficiently, which are critical structural motifs widely present in biologically active molecules.
Keyword ：
cyclization cyclization difunctionlization difunctionlization FSO2 radical FSO2 radical gamma-lactone gamma-lactone photoredox photoredox
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Fang, Xin , Geng, Xuebing , Wang, Peng et al. FSO2 Radical-Initiated Photoredox Cyclization of 4-Enoic Acids to Functionalized γ-Lactones [J]. | SYNTHESIS-STUTTGART , 2023 , 56 (11) : 1727-1734 . |
| MLA | Fang, Xin et al. "FSO2 Radical-Initiated Photoredox Cyclization of 4-Enoic Acids to Functionalized γ-Lactones" . | SYNTHESIS-STUTTGART 56 . 11 (2023) : 1727-1734 . |
| APA | Fang, Xin , Geng, Xuebing , Wang, Peng , Zhang, Honghai , Liao, Saihu . FSO2 Radical-Initiated Photoredox Cyclization of 4-Enoic Acids to Functionalized γ-Lactones . | SYNTHESIS-STUTTGART , 2023 , 56 (11) , 1727-1734 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Donor-acceptor (D-A) hybrid frameworks with visual X-ray photochromism at room temperature are fascinating because of their promising applications as X-ray detectors. Herein, a 3-fold interpenetrated D-A hybrid framework, [Eu(bcbp)(1.5)(DMF)(H2O)(2)][Co(CN)(6)]middot4H(2)OmiddotCH(3)OH (1), has been obtained by incorporating electron-rich Co(CN)(6)(3-) into the electron-deficient europium viologen framework, which interestingly exhibits ultraviolet and low-power X-ray dual photochromism with a remarkable color change from brown to green. Experimental and theoretical studies revealed that the X-ray photochromic behavior of hybrid 1 could be attributed to its D-A hybrid structural feature increasing the extent of photoinduced electron transfer and thus photogenerated radical species upon X-ray irradiation. Meanwhile, due to the introduction of emissive lanthanide cations in the D-A system, hybrid 1 exhibits photomodulated luminescence properties.
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wang, Yi-Wen , Li, Meng-Hua , Zhang, Shu-Quan et al. A Three-Component Donor-Acceptor Hybrid Framework with Low-Power X-ray-Induced Photochromism [J]. | INORGANIC CHEMISTRY , 2022 , 61 (21) : 8153-8159 . |
| MLA | Wang, Yi-Wen et al. "A Three-Component Donor-Acceptor Hybrid Framework with Low-Power X-ray-Induced Photochromism" . | INORGANIC CHEMISTRY 61 . 21 (2022) : 8153-8159 . |
| APA | Wang, Yi-Wen , Li, Meng-Hua , Zhang, Shu-Quan , Fang, Xin , Lin, Mei-Jin . A Three-Component Donor-Acceptor Hybrid Framework with Low-Power X-ray-Induced Photochromism . | INORGANIC CHEMISTRY , 2022 , 61 (21) , 8153-8159 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Photocatalysis is an efficient and green technology in the environmental protection. Due to the high charge separation and transfer, donor-acceptor (D-A) conjugated polymers attract much attention for their photocatalytic degradations towards organic pollutants. Herein, the authors reported three novel D-A conjugated polymers, named as HPBP, HPTP, and HPF, with heptazine moieties as electron acceptors, while biphenyl, terphenyl, or fluorene moieties as electron donors, respectively, which indeed exhibit a highly efficient photocatalytic degradation towards tetracyclines upon the visible-light irradiation. Among them, the photocatalytic performance of HPF is especially noticeable with the degradation rate up to 87% within 30 min, almost 11 times in comparison to those of pristine g-C3N4, which is mainly attributed to its high crystallinity and conjugation. For their photocatalytic mechanism, the center dot O-2(-) radical anions are regarded as the active species.
Keyword ：
conjugated heptazine polymers conjugated heptazine polymers donor-acceptors donor-acceptors narrow band gaps narrow band gaps photocatalytic degradation photocatalytic degradation tetracyclines tetracyclines
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Li, Zhen , Zeng, Wei , Li, Meng-Hua et al. Donor-Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines [J]. | MACROMOLECULAR RAPID COMMUNICATIONS , 2021 , 42 (24) . |
| MLA | Li, Zhen et al. "Donor-Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines" . | MACROMOLECULAR RAPID COMMUNICATIONS 42 . 24 (2021) . |
| APA | Li, Zhen , Zeng, Wei , Li, Meng-Hua , Zheng, Jun-Feng , Fang, Xin , Lin, Mei-Jin . Donor-Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines . | MACROMOLECULAR RAPID COMMUNICATIONS , 2021 , 42 (24) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Carbon nitrides are an emerging class of metal-free polymeric photocatalysts but limited by the structural modifications. With the same central skeleton, small-molecule carbon-nitride dyes (also called heptazine dyes) have attracted widespread attention in the past decades. Herein, by introducing the electron-rich aryl substituents at three peripheral positions, four donor-acceptor (D-A) heptazine derivatives have been synthesized via Friedel-Crafts reactions, and their photocatalytic hydrogen evolution properties have been carefully investigated. Presumably, due to the most effective conjugation and reasonable HOMO and LUMO positions, the optimized heptazine 4 with three 4-methylbiphenyl substituents exhibited an impressive thermally activated delayed fluorescence (TADF), which indicated it possessed the maximized photoinduced charge separations, and thus presented the highest photocatalytic activity. This work not only contributes to the small-molecule carbonnitride dyes, but also has an instructive significance on understanding the electron-transfer mechanism of carbon nitride photocatalysts at the molecular level.
Keyword ：
Photocatalytic hydrogen evolution Photocatalytic hydrogen evolution Photoinduced charge transfer and separations Photoinduced charge transfer and separations Small-molecule carbon-nitride dyes Small-molecule carbon-nitride dyes Structural design Structural design Thermally activated delayed fluorescence Thermally activated delayed fluorescence
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zheng, Jun-Feng , Xie, Zhi-Peng , Li, Zhen et al. Structural design of small-molecule carbon-nitride dyes for photocatalytic hydrogen evolution [J]. | DYES AND PIGMENTS , 2021 , 185 . |
| MLA | Zheng, Jun-Feng et al. "Structural design of small-molecule carbon-nitride dyes for photocatalytic hydrogen evolution" . | DYES AND PIGMENTS 185 (2021) . |
| APA | Zheng, Jun-Feng , Xie, Zhi-Peng , Li, Zhen , Chen, Yong , Fang, Xin , Chen, Xiong et al. Structural design of small-molecule carbon-nitride dyes for photocatalytic hydrogen evolution . | DYES AND PIGMENTS , 2021 , 185 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
